I actually have a SparkFun RedBoard, but I think this question applies to Arduino Uno and other boards as well.
I'm wondering how much control the programmer has over the various LEDs on the board. First there's the "ON" LED which is very bright. Can this be turned off or dimmed, or do I need to resort to electrical tape?
More annoying is the "TX" and "RX" LEDs. These blink rapidly when data is being communicated over the USB-serial connection. I'm guessing these are not configurable, but I couldn't find the answer anywhere online.
I know that the "Pin 13 LED" can be controlled (via Pin 13!).